Filter.



' Y Patented luly I6, |90I. F. E. BACHMAN.

FILTER. (Application med oct. 31.1900.) (No Model.) 3 Sheets-$heet 1.

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No. 678,532. Patented luly I6, I90I.

` F. E. BACHMML FILTER.

(Applimion med oet. si.; 1900.) (No Model.) 3 Sheets-Sheet 3.

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UNITED STATES- ,PATENT OFFICE.

FRANK E. BAcHMAN, orBUFFALo, NEwYoRK.

FILTER.

SPECIFICATION forming part of Letters Patent N0. 678,532, dtxed Jy 16, 1901- Appiimiun financi-ober 31, 1900. sentano. 34,985. (No man.) p

To all whom, it may concern:

Be it known that I, FRANK E. BAOHMAN, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and' useful Improvements in Filters, of which the following is a speciiication.

My invention relates to an improved iltering apparatus which is principally adapted to be used in connection with the-water-purifying plant described and claimed in my companion application, filed March 21, 1900, Serial One of the main objects of the invention is to provide the filters with a base-plate of simple and cheapV construction upon which the filter-bed is supported, and another object is to connect the filters Aby a simple ar= rangement of pipes, so that While one filter is operating the other may be Washed and cleaned out.

For a full understanding of the merits and advantages of the invention, reference is to be had to the accompanying drawings and the following description.

The invention is susceptible to various changes in the` form, proportion, and minor details of construction without departing from the principle or sacrificing any of the advantages thereof; and to a full disclosure of the invention an adaptation thereof is shown in the accompanying drawings, in which- Figure 1 represents .a side elevation of a pair of filtersconnected together by a suitable arrangement of pipes. Fig. 2 is a top plan view. Fig. 3 is a vertical central section through one of the filtering-tanks. Fig. 4 is an'enlarged detached top view of the perforated cleaning device. Fig. 5 is a horizontal section on or about line b h, Fig. 3. Fig. 6 is an enlarged fragmentary top view of a portion of the slotted filter-plate. Fig. 7 is an enlarged top view of one of the strainerplates. Fig. 8 is an enlarged bottom view of one of the strainer-plates. Fig. 9 Vis a section through one of thestrainer-plates on or about line c c, Fig. 7. Fig.'10 is an enlarged fragmentary top plan view of the lower portion of the piping connecting the lters. Fig. 11 is an enlarged fragmeutarysection through one of the check-valves.

' slots.

The filtering-tanks are preferably constructed as shown in Figs. 1, 2, and 3, having a cylindrical body 1, a concavo-convex bottom 2, a top 3, an inlet 4 in the top into which the lower end of one of the inlet-pipes 5 eX- tends, a perforated filter-plate 6, arranged horizontally a shortdistance above the concavo-convexbottom and rigidly riveted or bolted to the horizontal inner portion of the annular angle-iron '7 by the rivets or bolts 8, the angle-iron being riveted or bolted to 'the :interior of the cylindrical body by rivets or bolts 9, and a wash-out or clean-out device is arranged above the filter-plate and rigidly fastened tothe 'inner horizontal portion of an annular anglefiron 10 by the curvedV rods 1l and lock-nuts 12, the angle-iron 10 being bolted or riveted to the interior of the body by the bolts or rivets 13.

The preferable construction of the lilterplate is shown in Figs. 5, 6, 7,8, and 9, in which the main circular lter-plate 6 is provided with a series of elongated slots or openings 14,and a plurality of small strainer-plates l5, corresponding in number to the elongated slots, are each detachably fastened on the cir cular filter-plate over one of the elongated Saidfstrainer-plates are each provided with a series of long narrow parallel openings, which are'arranged as shown in the section in Fig. 9, having the top portion 16 eX tremely narrow in width to prevent the passage of the material of the ilter-bed and Widening into the larger bottom portion 17.

The strainer-plates 15 are preferably arranged so that their narrow parallel openings extend transversely or at right angles to the elongated slots in the large circular lterplate, and they are detachably secured in place by bolts 18, which pass through holes 19 in the strainer-plates into the filter-plate to afford convenient means for removing, cleaning, or replacing clogged or defective plates. A

The preferable construction of the washout or clean-out device is shown in Fig. 4, in which two perforated pipes 20 and 21 are arranged concentrically with eachother and are connected together by a cross-pipe 22, which extends diametrically with respect to thecircular pipes and is connected to each pipe on either side by tubularconnections 23.

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Another cross-pipe 24, extending at substantially right angles to the cross-pipe 22, is connected at each end to the smaller pipe 20 by tubular connections 25, and a four-way connection 26 is arranged centrally with respect to the concentric circular pipes and connects the pipes 22 and 24 at their crossing-point. Each of the pipes 2O and 2l is preferably formed in sections or segments, which are connected together by sleeves 27, and the main cross or connecting pipe 22 extends through the side of the filter-body, as will be more specifically described hereinafter. The circular concentric pipes and the cross-pipes are each provided with a plurality of aper tures or orifices 28, and the filter is preferably filled with filtering material up to the horizontal dotted line y in Fig. 3, the filter-bed being supported upon the circular filterplate 6.

The filters are preferablyarranged in pairs in side-by-side position, as shown in Figs. 1 and 2, and the main cross-pipe 22 of the washout device of each filter extends through the side of the filter and into connection with an upper transverse horizontal pipe 29,which in turn connects at or near its middle with a short upwardly-extending vertical pipe 30. Said pipe 30 has an elbow 3l atits upper end, which connects to a pipe 32, leading to a source of pater-supply. A vertical pipe 33 extends downwardly from the pipe 29 at one side of the short vertical pipe 30 and connects at its lowerend to one of the two lowertransverse horizontal pipes 34, each of which is provided with two shut-olf cocks 35 and 35, and a short horizontal pipe 36 extends from each of the pipes 34 from a point between its cocks 35 and 35a (see Fig. 10) outwardly into connection with a second lower horizontal pipe 37, from which short horizontal pipes 38 extend into the filter-tank below the circular filter-plate 6. The second lower horizontal pipe 37 is provided with check-valves which are arranged to close automatically during the Washing out of one of the filters. These check-valves are preferably formed as shown in Fig. ll, in which the pipe 37 is provided with enlargements 39, which each forma box for a swinging leaf 39, hung from horizontal pivots 391', journaled in the upper portion of the enlargements. The movement of the leaf in one direction is limited by a rib 39C, extending upward from the interior of the bottom of the pipe. The object of the checkvalve is to provide an automatic one-way valve that cannot be closed to prevent the passage of water from the filter, and thus produce dangerous pressure in the filter.

A filter provided with the ordinary valve usuallyemployed may be burst by the waterpressure should a careless workman close the valveandneglecttoopenit. Asmyimproved check-valve is opened automatically by the water-pressure, this danger is entirely obviated.

The pipe 32 is provided Withashut-od cock 40, and the upper horizontal pipe with a cock 41 at each end.

The secondary horizontal pipe 42, having two shut-off cocks 45, connects the short vertical inlet-pipes 5 below a main horizontal pipe 43, which is connected to the main water-supply pipe 44 and has two shut-off cocks 49a, and a horizontal pipe 46 connects to said pipe 42 at or near the middle thereof and extends forward at substantially right angles and then bends and extends vertically down- Ward in front of the filter, as shown at 47 in Figs. 1, 2, and 10, its lower end being arranged directly above the funnel-mouth 48 of the washout-pipe 49. (See Fig. 1.)

The inner end 50 of the horizontal pipes 34 each bend downward and discharge into the funnel 48. (See Fig. l.)

With the above construction one of the filters can be cleaned out while the other is in operation, by water direct from a supply-pipe, by opening the cock 40 of the pipe 32, the cock 41 controlling the admittance of water into the clean-out device of the filter requiring cleaning, and opening the cock 45 to permit the cleaning-water to pass from the filter to the waste-pipe and closing the cock 49n of the lter requiring cleaning, the check-valve in the pipe 37 closing automatically; or both filters can be cleaned at the same time by closing both of the inlet-cocks 49 and open-v ing the cock 40 and both pairs of cocks 4l and 45. It is found preferable, however, to clean one filter by means of heated water taken directly from the other filter, as the coagulating impurities are more easily removed by hot water. My improved filter is preferably employed in connection with the apparatus shown in my pending application, filed March 21, 1900, Serial No. 9,524, in which the Water is heated before reaching the filter. To do this, the cock 49a is closed,the cock 45 is opened, the cock 35a, which is for draining only, is closed, and the cock 35, communicating with the operating-filter, is opened sufficiently to permit the proper amount of water to pass from the operating-filter into the filter requiring cleaning and then pass into the waste.

The check-valve in the pipe 37 closes automatically by back pressure of water to prevent the passage of the water into the filter through the pipe 38.

The object of the short pipe 36 is to provide means for the passage of the cleaningwater in the filter, as the Water cannot fiow back through the pipe 37 owing to the check- Valve 39.

The cock 35 is usuallyleft open to the waterpassage and is only closed when it is desired to cut one filter off from its companion.

I claim as my invention- 1. A filtering-tank having agranular filtering medium and an inlet and outlet, concentric circular perforated clean-out pipes arranged in the granular filtering medium and near the top surface thereof, and a perforated IOO IIO

filter-plate between the clean-out pipes and the outlet having a plurality of detachable strainer-plates.

2. A filtering-tank having a granular filtering medium and an inlet and outlet, concentric circular perforated clean-out pipes arranged in the granular filtering medium and near the top thereof, a filter-plate between the clean-out pipes and the outlet having a plurality of elongated slots and a plurality of strainer-plates corresponding in number to the slots and each arranged upon one of said slots and each having a series of narrow open-v ings extending transversely to the slot, as set forth.

3. A ltering-tank having a granular liltering medium and an inlet and outlet, concentric circular perforated clean-out pipes arranged in the granular filtering medium and near the top thereof, a filter-plate between the clean-out pipes and the outlet having a plurality of elongated slots and a plurality of strainer-plates corresponding in number to the slots, and each detachably arranged upon one of said slots, and each having a series of narrow parallel openings extending transversely to the slot, said slots widening from the top downward, as set forth.

4. In combination, two filters, an inlet-pipe connected to the top of each filter and having connection with a source of water-supply, an upper valved connection between said inlets, a waste-outlet, a pipe leading from the valve connection to said waste-outlet, an intermediate pipe having its ends extending through the sides of the filters, concentric circular clean-out pipes within the filters connected to the intermediate pipe, anoutlet-pipe connected to the lower portion of each filter, a lower valved connection between the outer ends of said outlets, two horizontal pipes each extending from a point between the ends of one of the outlets and having their inner ends emptying into the waste-outlet and short pipes connecting said horizontal `pipes to the lower valved connection, as set forth.

5. A filter-tank having a filter-plate provided with slots and a series of strainer-plates having a plurality of narrow openings and each strainer-plate arranged above one of the' slots in the lter-plate with its openings crossing said slot.

6. In an apparatus for purifying water, a filter-tank having a iilter-plate provided with slots and a series of strainer-plates having a plurality of narrow parallel openings and each strainer-plate arranged above one of the slots in the filter-plate with its openings extending transversely to the slot.

7. A filter having two concentric perforated cleaning-pipes, a straight perforated pipe eX- tending across the inner concentric pipe and a straight perforated pipe crossing both of the concentric circular pipes and the first-mentioned straight pipe.

8. Afilter having a cleaning device composed of two circular concentrically-arranged pipes provided with perforations, and straight perforated cross-pipes connecting said circular pipes and arranged at angles to each other.

9. In combination, two filters, an inletpipe connected to each lter and having connection to' a source of water-supply, an upper valved connection between said inlets, a waste-outlet, a pipe leading from the upper valved connection 'to said waste-outlet, an intermediate pipe having its ends extending through the sides of the filters, concentric circular clean-out pipes within the ilters connected to the intermediate pipe, an outletpipe connected to the lower portion of each iilter, a lower connection between the outer ends of said outlets, check-valves in said connection operated automatically by back pressure of water, two horizontal pipes each eX- tending from a point between the ends of one of the outlets and having their inner ends 11. In combination, two filters, an inlet-` M pipe connected to each filter and having conroo nection with a source of water-supply, a plurality of pipes connecting said filters, shutoff cocks in said pipes, and check-valves in FRANK n. BAcHMAN.

Witnesses:

W. H. EVERHART, E. S. CARTER.

IIO 

